<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        #outer {
            width:500px;
            margin:0 auto;
            padding:0;
            text-align:center;
        }

        #div1 {
            width:100px;
            height:100px;
            background:black;
            margin:10px auto;
            display:block;
        }

    </style>
</head>
<body>
<div id="outer">
    <input type="button" value="变宽" />
    <input type="button" value="变高" />
    <input type="button" value="变色" />
    <input type="button" value="隐藏" />
    <input type="button" value="重置" />
    <div id="div1"></div>
</div>
<script>
    var changeStyle = function (elem, attr, value) {
        elem.style[attr] = value
    };
    window.onload = function () {
        var oBtn = document.getElementsByTagName("input");
        var oDiv = document.getElementById("div1");
        var oAtt = ["width","height","background","display","display"];
        var oVal = ["200px","200px","red","none","block"];

        for (var i = 0; i < oBtn.length; i++) {
            oBtn[i].index = i;
            oBtn[i].ckinmind = i;

            console.log(oBtn[i].ckinmind);
            oBtn[i].onclick = function () {
                this.ckinmind == oBtn.length - 1 && (oDiv.style.cssText = "");
                changeStyle(oDiv, oAtt[this.ckinmind], oVal[this.ckinmind])
            }
        }
    };
/*
1.




*/

</script>
</body>
</html>
